青岛联通IDC实现全部流量直联骨干网

青岛联通IDC正式告别了骨干网和省网“双口并流”的时代,今后全部出入流量都将直联骨干网。直联后,IDC客户减少了通达其他地区所需要的网络跳转次数,速度将有一定程度的提高;同时,互联网企业客户在青岛联通IDC部署资源时,无须考虑对省内和省外客户的不同策略,     

一种多出口链路自动检测及调优方法

在移动互联网时代,企业对外出口的通道,对用户的互联网业务体验和感知具有重要影响。企业第三方出口是指通过除电信、联通之外的第三方运营商疏通CMNET网外流量的一种互联网接入方式。当前主要采用引入第三方转接的方法来扩展本省互联网出口带宽,疏通本省网间访问流量,从而达到提升网络质量的目的。文章通过优化方案来调整第三方出口结构通过接入负载均衡器方式,自动调整出口流向流量,最终保障业务的安全运行。     

基于SDN的互联网域间路由研究

互联网流量的爆发式增长,叠加互联网流量固有的突发性特点,使得网络流量不均衡现象日益加剧。传统BGP协议由于缺乏全网拓扑和全局流量观,只能遵循标准BGP选路原则,在解决流量调度和负载均衡方面存在不足。针对BGP协议存在的局限性,研发了基于RR+的互联网骨干网流量调度系统,并应用于ChinaNet骨干网的网内中继、网间互联出口、IDC出口等多个流量优化场景。更进一步地,提出了一种基于SDN的互联网域间路由架构,通过在域间控制器之间交换BGP路由,无需在域内和域间运行BGP协议,极大地简化了网络协议,并能够实现灵活的流量调度和负载均衡。     

一种承载网网络优化方法研究

本文通过分析A省、B省、C省移动CMNET骨干网协议及A省移动现网网络组网结构问题,提出业务承载优化方案,将IGP协议承载业务调整为BGP协议,按照不同时期组网结果,通过调结构、控流量实现出、回程流量均衡,达到网络负载均衡的效果,提升了网络链路利用率,减少了扩容成本,为基础通信企业骨干承载网的网络优化提供了解决方案.     

多运营商出口解决方案研究

Internet业务持续快速增长，对各运营商网间互访的需求越来越大。文章首先介绍了国内各大运营商网络互访的现状，接着分析了传统CMNET出口带来的两点问题，随后提出了多运营商出口解决方案，并阐述了其组网方式、工作原理及优势。     

基于客户使用行为的网间高额结算费用监控分析

针对目前互联互通恶性事件时常发生,出现网间异常通话行为,进一步造成移动通信运营商网间高额结算费损失的问题,提出了一种基于客户使用行为的网间高额结算费用监控分析方法,并应用到广西移动的运营支撑系统中,及时发现网络间异常通话的行为,方便监控网间结算费用情况和核对分析数据,将公司的网间结算费损失控制在尽可能小范围内,保障公司利益.     

IDC系统组网设计探讨

【】：IDC业务近年来发展迅速,组网技术也是多种多样,本文简明扼要的介绍一种代表性规划设计组网方法,能够为快速搭建IDC系统提供参考。文中重点介绍网络安全设备之间的链路如何连接、网络安全设备覆盖流量比例、DPI系统和信息安全系统的对接、SDN技术应用,并提出IDC后台管理系统需要提供的基本功能。     

网间异常话务分析及处理

本文简要介绍了网间异常呼叫的监测方法,主要叙述了网间异常呼叫现象的甄别及分析,目的是及时发现并采取相应措施以减少话务流量的流失和套费的发生。     

构架中国的“数码大厦”

因特网数据中心（IDC）已成为承截各种模式电子商务的基本设施。作为新的服务模式,IDC重新创造了因特网服务的价值链,形成了不同分工的因特网服务提供商。高速、安全是IDC提供高质服务的两个方面。IDC改变了传统客户/服务器的服务模式,将ICP的访问服务器从边缘移到了高速核心骨干网中心交换点,从而减少了不必要的承载负担,提高了有效速度。而多节点数据中心通过容灾备份保证了数据安全,是未来发展趋势。     

互联网骨干网互联互通国际通用模式

近年来,我国互联网业务飞速发展,互联网流量不断增长,各大互联网骨干网运营商纷纷扩大网络容量,以满足市场需求。与此同时,互联网骨干网间的互联互通问题日益突现,鉴于此,本文旨在通过研究国际通用模式以获得对中国制定互联网骨干网互联互通模式的启示。     

建设自有骨干传输网，掌握市场主动权——支招中国移动

摆在中国移动面前的关键课题是要建设自有的传输网络。拥有自己的传输网络不仅能满足中国移动本身移动语音业务增长的需求,还能快速发展宽带数据业务,实现带宽批发、带宽出租,争取新一轮市场竞争的先机。本文从干线网和城域网建设两个方面给出了中国移动传输网络建设的建议。     

The sink tree paradigm: connectionless traffic support on ATM LAN's

Asynchronous transfer mode (ATM) is a connection-oriented technology in which all communication is based on virtual connections established prior to the transfer of data. It is expected that the bulk of traffic carried by the ATM network will be data traffic, e.g., local area network (LAN) internetwork traffic. Hence, a major issue regarding ATM is the support for connectionless (datagram) traffic. A scheme for the efficient support for connectionless traffic in ATM LANs based on trees of virtual connections is proposed. In this scheme, a sink tree is built for every switch in the LAN. Each tree provides an efficient means of routing connectionless traffic from any switch in the network to the sink switch (root) of the tree. The sink tree solution may also be used to broadcast connectionless messages in the reverse direction. The trees can easily be updated to adapt to topological changes or congestion in the network. A protocol for refreshing the tree structure using the ATM switch routing tables is described. An adaptive rate control solution, in conjunction with fast back pressure at the ATM layer, is presented. It is shown that this scheme achieves high utilization of available bandwidth for connectionless traffic, has low cell loss probability, and small overhead     

Interprovider differentiated service interconnection management models in the Internet bandwidth commodity markets

Due to the recent evolution of telecommunications infrastructure and the Internet as a commodity market for bandwidth, Internet Service Providers (ISPs) encounter new issues concerned with bandwidth management for the network interconnection. Bandwidth commodity exchange is considered a new B2B (Business-to-Business) electronic commerce application that brings new market opportunities to carriers and service providers for managing their bandwidth resources. This paper develops market-based bandwidth management optimization models for Differentiated Service (DiffServ) QoS (Quality of Service) networks using an implementation of the bandwidth management agent, BMP (Bandwidth Management Point). We use network economic models to formulate an optimization problem for the interconnection and resource allocation policy of the DiffServ network. We formulate and develop those economic models as optimization problems of LP, NLP, MILP and mixed integer nonlinear programming (MINLP), and discuss the pricing mechanisms and available solution approaches for the implementation of the BMP's resource optimization process. Different opportunity costs are estimated based on the results of a network simulation using traffic flow statistics measured from a recent Internet backbone. We then numerically simulate the behavior of backbone network ISPs to optimize their profits for various demand scenarios.     

中国移动PTN客户接入设备的现状和规范化路径

随着中国移动对集团客户业务的重视程度越来越高,针对集团客户的网络服务标准越来越严格,以光纤收发器为代表的传统PTN客户接入设备已经无法满足集团客户网络服务管理要求,本文根据中国移动集团客户网络运维和成本控制等相关要求,深入探讨推动PTN客户接入设备规范化的方式方法,为中国移动集团客户业务的快速发展提供有力支撑.     

国家级互联网骨干直联点建设方案分析

【】：国家级互联网骨干直联点(以下简称骨干直联点),作为国家重要通信枢纽,主要用于汇聚和疏通全国网间通信流量,是我国互联网网间互联架构的顶层关键环节。目前已在全国13个城市建成,开通网间互联带宽总量达2T。本文针对骨干直联点的特点及存在问题,分析增设骨干直联点对网络质量、流量均衡等方面的影响,提出了建设骨干直联点的方案,并对各种不同方案进行比较,为骨干直联点的实际建设提供指导。     

有线宽带业务发展对运营商IP承载网络演进的影响

随着有线宽带业务的发展,以视频为主的有线宽带业务对网络承载能力提出了新的要求.分析了有线宽带业务流量疏导对带宽和网络质量的需求,从多播技术应用,BRAS、CDN部署方式,骨干网架构演进等多个角度,提出了可行的网络演进方案.     

Suitability of DAMA and Contention-Based Satellite Access Schemes for TCP Traffic in Mobile DVB-RCS

The problem of optimizing access and bandwidth sharing among transmission control protocol (TCP) connections in the mobile digital video broadcasting return channel via satellite (DVB-RCS) is tackled in this paper. After sketching the general system architecture, we explicitly deal with the dynamic assignment of bandwidth to TCP connections on the return link, which is accomplished by a network control center (NCC) placed onboard the satellite. Mobile users access the satellite in multifrequency time-division multiple access (MF-TDMA), whereas they receive data from the NCC in time-division multiplexing (TDM). Two different techniques, based on deterministic and random access, are compared in terms of bandwidth usage and average completion time per connection, when the mobile user acts as both server and client. In the server case, to increase the TCP throughput, both packet-level forward error correction (FEC) on data sent by mobile users and a duplicated and delayed acknowledgment technique for TCP acknowledgment traffic from the NCC to the mobile users are applied. An analysis of the packet losses and a simulation campaign of file transfers by employing a realistic channel model has been carried out. The results of the analysis show the convenience of adopting a technique, in addition to the optimal data redundancy in different cases, such as the server or client role of users, their willingness to pay, the file size, and the environment type.     

Interleaved Polling with Adaptive Cycle Time (IPACT): A Dynamic Bandwidth Distribution Scheme in an Optical Access Network

While in recent years backbone bandwidth has experienced substantial growth, little has changed in the access network. Last mile still remains the bottleneck between a high capacity LAN or home network and the backbone. Passive optical network (PON) is a technology viewed by many as an attractive solution to this problem.In this study, we discuss and evaluate design issues for PON access networks. Specifically, to drive the cost of an access network down, it is very important to have an efficient, scalable solution. We believe that a PON based on polling, with data encapsulated in Ethernet frames, possesses the best qualities, such as dynamic bandwidth distribution, use of a single downstream and a single upstream wavelength, ability to provision a fractional wavelength capacity to each user, and ease of adding a new user.To support dynamic bandwidth distribution, we propose an interleaved polling algorithm. We then suggest a scheme for in-band signaling that allows using a single wavelength for both downstream data and control message transmission.To obtain realistic simulation results, we generated synthetic traffic that exhibits the properties of self-similarity and long-range dependence. We then analyzed the network performance and its effect on various types of traffic, e.g., best-effort data traffic, VBR video traffic and CBR streams.     

量子保密通信网络骨干链路流量规划

量子保密通信网络是一种新兴的安全网络。如何通过合理的流量规划方法提升量子保密通信网络骨干链路的带宽利用率、提升网络性价比是一个新问题。分析了量子保密通信网络流量规划的特殊性,给出了一种流量规划模型,可以实现下列 3 个方面的目标：在确定网络骨干链路密钥分发带宽的情况下,可以实现用户广域加密通信带宽的规划;借助路由规划可以提升用户广域加密通信带宽和量子链路密钥分发带宽的利用率;可以实现对网络瓶颈量子链路密钥分发带宽的合理调整。最后,通过数值模拟示例演示了本文所提出的流量规划方法的应用。     

Design and Configuration of Reconfigurable ATM Networks with Unreliable Links

This paper considers a problem of configuring both physical backbone and logical virtual path (VP) networks in a reconfigurable asynchronous transfer mode (ATM) network where links are subject to failures. The objective is to determine jointly the VP assignment, the capacity assignment of physical links and the bandwidth allocation of VPs, and the routing assignment of traffic demand at least cost. The network cost includes backbone link capacity expansion cost and penalty cost for not satisfying the maximum throughput of the traffic due to link failures or insufficient link capacities. The problem is formulated as a zero-one non-linear mixed integer programming problem, for which an effective solution procedure is developed by using a Lagrangean relaxation technique for finding a lower bound and a heuristic method exploited for improving the upper bound of any intermediate solution. The solution procedure is tested for its effectiveness with various numerical examples.